Cancelled Missions: Skylab Rescue Mission (SL-R)
Mission patch for rescue mission for SL-3
Spacecraft: CSM-119
Launch Vehicle: Saturn IB AS-208, later AS-209
Commander: Vance D. Brand
Command Module Pilot: Don L. Lind
Intended launch date: September 1973, (on standby from August 1973 - February 1974)
Skylab rescue mission crewmen Vance Brand (left) and Don Lind.
"Influenced by the stranded Skylab crew portrayed in the book and movie 'Marooned', NASA provided a crew rescue capability for the only time in its history." Prepared for launch during Skylab 3."
"Skylab rescue vehicle phasing - NAR Space Division drawing illustrates phasing of 5-seater Skylab rescue vehicle for a Skylab mission."
Date: April 5, 1971
"A kit was developed to fit out an Apollo command module with a total of five crew couches. In the event a Skylab crew developed trouble with its Apollo CSM return craft, a rescue CSM would be prepared and launched to rendezvous with the station. It would dock with the spare second side docking port of the Skylab docking module."
- information from Astronautix.com: link
"The Apollo Command Module as modified to rescue stranded crews for the Skylab program. Two crew + three rescuees packed like sardines...."
"Skylab 3 astronauts Alan Bean and Jack Lousma helped design the "field modification kit" to use a standard CSM for rescue, and would have flown the CSM for their mission to rescue Skylab 2 if necessary. The standard Skylab Command Module accommodated a crew of three with storage lockers on the aft bulkhead for resupply of experiment film and other equipment, as well as the return of exposed film, data tapes and experiment samples. To convert the standard CSM to a rescue vehicle, the storage lockers were removed and replaced with two crew couches to seat a total of five crewmen."
Posted on Flickr by Mike Acs. NASA ID: 108-KSC-70P-69
"Soon after Skylab 3's launch the crew's CSM developed a problem with Quad B, one of its four reaction control system thrusters. On August 2, 1973, six days later, a snowstorm-like effect outside the station startled the crew during breakfast. What appeared to be 'a real blizzard' was fuel leaking from Quad D, opposite from Quad B. The malfunctions left two available quads, and while the spacecraft could operate with just one, the leaks posed a possible risk to other systems. The fuel for all quads and the main service propulsion system (SPS) engine were from the same batch; if the SPS fuel was contaminated, the CSM might not be able to deorbit.
source
NASA considered bringing the crew home immediately, but because the astronauts were safe on the station with ample supplies and because plans for a rescue flight existed, the mission continued while the Saturn IB rocket AS-208 with CSM-119 was assembled in the Vehicle Assembly Building at Launch Complex 39 for possible use. It was at one point rolled out to LC-39B.
Illustration of the rescue Apollo spacecraft preparing to dock at Skylab’s lateral port. source
NASA announced on August 4 that Skylab 3 and Skylab 4 backup crewmen Vance Brand and Don Lind would fly any rescue mission; they had immediately begun training for the flight once the second quad had failed on August 2. After engineers found that the leaks would not disable the spacecraft, the two men used simulators to test reentry using two quads. If ground personnel worked 24 hours a day and skipped some tests, the mission could launch on September 10, and would last no more than five days. The astronauts would attempt to prepare Skylab for further use but returning experimental data and diagnosing the cause of the problem were more important, with Lind choosing what would be brought back. Human urine and feces samples and Apollo Telescope Mount and other film were the priorities. Although Skylab had two docking ports the primary one would be used if possible, jettisoning the Skylab crew's CSM if necessary.
Posted on Flickr by Drew Granston: link
While many within NASA believed that the rescue mission would occur, within hours of the failure of the second quad the agency canceled the rescue mission. Beyond NASA's conclusion that the failed quads would not disable the Skylab 3 CSM and the SPS fuel was uncontaminated, Brand and Lind had already shown during their training as backup Skylab crewmen that a reentry with failed quads was safe. They also devised a method to deorbit with the command module's attitude control system. Later joking that they were 'very efficient but perfectly stupid, because we have literally worked ourselves out of the mission', Brand and Lind continued to train for a rescue mission, as well as for their backup roles, but the Skylab 3 crew was able to complete its full 59-day mission on the station and safely return to Earth using the two functional RCS thruster quads, using the SPS engine once instead of twice as precaution."
- Information from Wikipedia: link
Posted on Flickr by Ed Dempsey: link
Saturn IB SA-208 was used for Skylab 4 and SA-209 was assigned to the standby rescue mission. At one point, CSM-119/SA-209 was slated for the Skylab 5 mission but it was cancelled when SL-4 was extended and completed all of it objectives.
Mission patch for rescue mission for SL-4
Later, CSM-119/SA-209 was the backup launch vehicle for Apollo-Soyuz Test Project mission and standby rescue vehicle. After the Apollo program ended, the surplus rocket and spacecraft were displayed at the Kennedy Space Center, Florida.
NASA ID: 71-H-662, S73-31922
source, source
